Quote Originally Posted by Buffalobiian View Post
Eris said she'd come back when she's more "worthy" of him.
Is that what the anime version said? The manga translation I read said:

"Right now, we're not a good match for each other.

I'm leaving on a journey, Eris."

I guess for a more positive person, it might sound like she's coming back, but deep down Rudeus is not an optimistic person. He only read it as "We aren't a good match. Farewell." It's not unreasonable either. They went through the dangerous, long journey back, but then she just disappeared leaving behind nothing but a letter that didn't really say anything. Anyone would take it as a negative sign.